LEM S ibrium and Oscillation 13. l The New England Merchants Bank Building in Bo

Question

LEM S ibrium and Oscillation 13. l The New England Merchants Bank Building in Boston is 152 m high. On windy days it sways with a frequency of 0.17 Hz, and the acceleration of the top of the building can reach 2.% of the free-fall acceleration, enough to cause discomfort for occu- pants. What is the total distance, side to side, that the top of the Restoring Forces and SHM lays the note "A." the string vibrates at in tomomtar ela-Ras -martinet Hand In Homework 4 Name DUE Thursday Feb 22 1) A sonic detector is used in the Physics labs and lectures to measure distances. It does this by sending sonic pulses from the detector which then reflect off an object back to the detector. The computer obtains the time between when the pulse is sent and when the reflected pulse is received. Calculate the travel time for a pulse that travels and reflects off an object that is one meter away from the detector and then a second object that is 15 meters from the detector.

Explanation / Answer

v_sound = 343 m/s

for 1 m away object,

t = (d + d) / v = 2 / 343 = 5.83 x 10^-3 sec Or 5.83 ms ...Ans

for 15 m,

t = 30/343 = 0.0875 sec or 87.5 ms

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